Knife mounting for planer chippers



May 31, 1960 Filed May 15, 1959 G. M. STANDAL KNIFE MOUNTING FOR PLANER CHIPPERS 5 Sheets-Sheet 1 Gar 0e M. 5 Zcmaal BY/Mw May 31, 1960 3. M. STANDAL KNIFE MOUNTING FOR PLANER CHIPPERS 5 Sheets-Sheet 2 Filed May 15, 1959 INVENTOR. 660/96 /Z Siam/a! agg May 31, 1960 s. M sTANDAL KNIFE MOUNTING FOR PLANER CHIPPERS Filed May 15, 1959 5 Sheets-Sheet 3 INVENTOR.

BY aff/ma May 31, 1960 cs. M. STANDAL 2,938,553

KNIFE MOUNTING FOR PLANER CHIPPERS Filed May 15, 1959 5 Sheets-Sheet 4 ll INVENTOR.

May 31, 1960 G. M. STANDAL KNIFE MOUNTING FOR PLANER CHIPPERS 5 Sheets-Sheet 5 Filed May 15, 1959 INVENTOR.

660/ 16 M fizandcz/ W g m United States Patent WIFE MOUNTING FOR PLANER CHIPPERS George M. Standal, Chemainus, British Columbia, Canada Filed May 15, 1959, Ser. No. 813,392

10 Claims. (Cl. 144-224) The present invention relates to a knifemounting for planer chippers. The planer chippers use a cylindrical head on the periphery of which a plurality of knives are mounted. It is the purpose of the present invention to provide a mounting on the head by means of which the knives can be mounted for adjustment as they are worn and sharpened to maintain them at the proper level and angle with respect to the work.

The objects and advantages of my invention will appear more fully from the following description and the accompanying drawings'wherein a preferred form of the invention is shown. It is obvious, however, that minor changes may be made in the structure within the scope of my invention as defined in the claims.

In the drawings:

Figure -1 is a plan view partly in section of a chipper head showing a knife mounting in placevand showing how the knife moves across the board;

' Figure 2 is an enlarged fragmentary plan view of a portion of a planer chipper head to which my invention is applied;

Figure 3 is an elevation view looking at Figure 2 from the line3 -3;

Figure 4 is an enlarged plan view of the knife mount- 2;

Figure 5 is an enlarged elevation view of the knife mounting;

Figure 6 is an enlarged forward edge view of the knife mounting;

Figure 7 is an enlarged rear edge view of the knife mounting, looking at Figure 5 from the line 7--7;

Figure 8 is an enlarged fragmentary sectional view taken on the line 8-8 of Figure 2;

Figure 9 is a plan view illustrating a modified form of knife mounting;

Figure 10 is a face view of the knife mounting of Figure 9;

Figure 11 is a sectional view taken on the line 11-11 of Figure 10;

Figure 12 is a plan view of the knife clamp used; and

Figure 13 is a side view of the knife clamp used.

My invention as illustrated in the drawings, provides a knife mounting on a head 1 of a machine for planing chips from rough lumber. The head 1 has a series of flat faces 3 around the exterior of its cylindrical skirt 2. These faces are centrally grooved to provide a mounting channel 4. The faces 3 are in planes that are perpendicular to radial lines drawn from the center shaft 5 that rotates the head 1. The mountings 6 for the knives 7 that do the actual cutting are secured against the faces 3.

Each mounting 6 comprises a base portion 8 which has a rib 9 that is fitted in a channel 4 of a face 3 on the head 1. The base portion 8 has flat faces 10 and 11 adjoining the rib 9 and engaging the face 3. The portion 8 is clamped to the face 3 by four bolts 12 that are threaded into the head 1. The base portion has a knife cradle 14 formed integral therewith and extending diagonally across the portion 8. The portion 8 is substan- 2,938,553 Patented May 31, 1960 tially thicker at its forward edge 8a than at its rearward edge 8b and has a rib immediately above the cradle 14 that provides a guide for one edge 7a of the knife 7.

The cradle 14 has its top face 14a flat and extending outwardly and downwardly away from the rib 80 at right angles to the face of the rib. The angle between the top face 14a and the plane of the outer face of the base portion 8 is about to degrees, as shown in Figure 7. An upturned lip 15 is provided along the outer extremity of the cradle 14. The inner face 15a of this lip is set at the proper angle to fit the outer surface 7e of the up turned nose 7b of the knife 7. The angle of the face 15a to the face 14a is about 100 to 105 degrees. The cradle 14 is drilled and tapped at 16a to mount a pair of threaded studs 16 for a clamp bar 17 adjacent to but spaced from the rib 8c. It is also drilled and tapped at 18 to mount a stop bar 19 that carries a pair of adjustable stop screws 20. The front edge 14c of the cradle 14 recedes outwardly at an angle of about 30 degrees to a line perpendicular to the adjacent face of the base 8. This front edge 14c lies in a plane perpendicular to the axis of the head 1 and the front bottom face of the cradle 14 is in this same plane.

With the mounting just described knives 7 can be. seated in the cradles 14 and clamped. Each knife 7 is slotted as indicated at 70 and 7d in Figure 8 so that as the knife is worn by use and sharpening it can be reset by means of the screws 20 and clamp bar 17. The planing chipper head 1, as best illustrated in Figure 1, has its axis of rotation substantially perpendicular to the surface of the board 37, that is being planed. As the board moves in the direction indicated in Figure 1, the knives 7 cut across the top face of the board with the nose portions of the knives severing the fibers and the fiat front edge portions of the knives shaving the severed fibers from the underlying board. The knife mountings 6 keep the several knives with their flat front edges in a plane perpendicular to the axis of rotation of the head 1. The mountings 6 position the cradle 14 so that its knife supporting surface 14a is tilted with respect to a radial line from the axis of the head 1 to slope downwardly away from the head, and so that the surface 14a is inclined upwardly toward the rear with respect to a line tangent to the head.

Referring now to the form of knife mounting shown in Figures 9-13 inclusive, this form of the invention uses a base portion 22 that is essentially similar to the base portion 8. The base portion 22 has a cradle 23 extending outwardly therefrom. The cradle 23 has a top face 24 that slopes downwardly and outwardly from an inner guide face 25 to an upstanding ledge 26. The cradle 23 inclines upwardly to the rear as best shown in Figure 10. The cradle 23 seats a knife 27 which is like the knife 7 except that it does not need to have the elongated apertures 7c and 7a.

The means for securing the knife 27 to the cradle 23 comprises a lug 28 on the base portion 22 spaced above the cradle 23 and threaded to receive two screws 29 and 30. A clamp bar retaining screw 31 is slidable in the lug 28 and held against dropping out by a cotter pin 32. The screw 31 is threaded into a clamp bar 33 which rests on the knife 27. The clamp bar 33 has two seats 34 and 35 formed in the top for the ends of the screws 29 and 30. The clamp bar 33 has a chip deflecting projection 36 that extends over to the knife nose 27b. The projection 36 leaves the bar 33 at an acute angle and is inclined upwardly toward the rear with respect to the top surface 24 of the cradle and is curved as shown in Figure 12. It extends as high as the knife nose 27b so it can deflect chips upwardly and outwardly over the knife nose 27b.

Positioning of the knife 27 lengthwise of the cradle 23is accomplished by a stop member 37 that is afiixed to the cradle 23 at the rear end thereof and affixed to the ledge 26 of the cradle. The member 37 is threaded to receive a screw 38..which provides an adjustable, stopat the rightpositionto engage the rear end. of the knife 27. Alock nut 39 is provided on the screw 38.

In both forms of the invention the mounting provides an inclined cradle on the exterior of the rotating head of the planing chipper, which cradle has the means'therein to retain the knives at the proper lead and angle with respect to the head. The cradle also provides ameans to adjust the knives readily as they are sharpened and become shorter.

Having described my invention, I claim:

1. In a planer chipper having arotary head provided With'knives having upturned noses, which knives are positioned on the head to plane a boardtsurface that is substantially perpendicular to the axis of rotation of the head, a mounting for each of said knives comprising a cradle aflixed to the head and projecting radially outward from the head, said cradle having a knife supporting surface that is inclined upwardly from its advancing edge toward the rear and that slopes downwardly away from the head, said mounting also comprisinga clamp bar overlying said surface, and means to press the clamp-bar against a knife resting on the inclined sloping surface.

2. The invention defined in. claim 1 wherein the mounting" for each knife includes an upturned lip along the outer extremity of the cradle.

3. The invention defined in claim 1 wherein said cradle has thereon a knife stop means on the upper rear portion of the knife supporting surface.

4. The invention defined in claim 1 wherein the mounting has a guide next to the head above the knife supporting surface for one side edge of the knife and an upturned lip along the outer extremity of the cradle adapted to engage the other side edge of the'knife.

5 The invention defined in claim 1 wherein said means comprises threaded studs extending up from the knife supporting surface through said clamp bar and nuts on said studs above the clamp bar.

6. The invention defined in claim 1 wherein said means comprises a lug overlying and spaced from the clamp bar, and members threaded in said lug and seated in the clamp bar.

7. In a planer chipper having a rotary head provided with knives having upturned noses which knives are positioned on the head with their cutting edges in a plane that is substantially perpendicular to the axis of rotation of the head, a mounting for each of said 'knives comprising a base portion having means to aflix it to said head, a cradle on said base portion projecting outward from the base portion, said cradle having a flat knife supporting'surface inclined away from the said plane from its advancing edge toward the rear, said supporting surface also being inclined toward the said plane from the base portion outwardly, a clamp bar overlying said surface, means on said mounting to force the clamp bar against a knife between the clamp bar and said surface, and a stop on the cradle limiting rearward movement of a knife on said surface.

8. The invention defined in claim 7 wherein said last named means comprises a lug on the base portion spaced above said cradle, and set screws threaded in said lug and extending therefrom toward said cradlesurface and perpendicular thereto.

9. The invention defined in claim 7 wherein the base portion has flat faces engaging the head and is substantially thicker at its forward edge than at its rear edge.

10. The invention defined in claim 7 wherein saidlast named means comprises headed studs threaded into said cradle and extending through the knife and the clamp bar.

References Cited in the file of this patent UNITED STATES PATENTS 678,795 Sprink July 16, 1901 1,122,471 Buckhart Dec. 29-, 1914 1,315,734 Mattison Sept. 9, 1919 1,820,231 Lane Aug; 25, 1931 2,710,635 Alexander June 14, 1955 2,884,031 Standal Apr. 28, 1959 

